Hardware Flow Control is indicated whenever a printer is having buffer overruns, is losing sections of a file, or is having other problems which can't seem to be resolved. Most printers are simply more reliable under hardware flow control.
1) The Printer
Should be set for hardware flow control.
On most printers this is DTR flow control (Okidata printers should be set for SSD- and Ready/Busy).
2) The Cable
Use the Standard Printer Cable as diagrammed in cable guide
3)The Unix server
Set up the printer spooler following the documentation included with your distribution. The spooler should not exercise flow control (because the port itself, which has just been set up, will handle the necessary flow control requirements).
May 09, 2019